Avery Original Book Rack Extendable 6 Section Black For a simple storage solution suitable for books and files try the modular book rack from the Avery Original range. This rack is great for offices that donít have much space for book shelves or where files need to be within easy reach on desks. It comes in black, hard wearing plastic with a set of 6 dividers so it is simple to make the rack as short or as long as needed.